1. If the pressure in a gas container that is connected to an open-end U-tube ma

Question

1. If the pressure in a gas container that is connected to an open-end U-tube manometer is 106 kPa and the pressure of the atmosphere at the open end of the tube is 742 mm Hg, the level of mercury in the tube will be:

a. 636 mm higher in the arm connected to the gas cylinder.

b. 53 mm higher in the arm open to the atmosphere.

c. 53 mm higher in the arm connected to the gas cylinder.

d. 636 mm higher in the arm open to the atmosphere.

Which of the noble gases should show the greatest deviation from the ideal gas law at high pressures?

Select one:

a. He

b. Rn

c. Ar

d. All deviate equally.

What is the temperature of CO2 gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?

Select one:

a. 1.31 × 103 K

b. 1.32 K

c. 9.92 × 105 K

d. 9.92 × 102 K

Explanation / Answer

1)

1 Kpa = 7.50 mmHg

so,

pGas = 106 kPa

= 106*7.50 mmHg

= 795 mmHg

pAtm = 742 mmHg

since pGas is more, it will be lower

difference = 795 mmHg - 742 mmHg

= 53 mm

Answer: b. 53 mm higher in the arm open to the atmosphere.

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